Viessmann Vitodens 100-W Wb1b - fluctuating DHW.

Joined
20 Mar 2009
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Location
Potters Bar
Country
United Kingdom
Serial number: 7373063107041101

Thought

Diverter
Phex
Thermistor
Or bathroom mixers.

Seems to go hot to very hot at kitchen tap.

But luke warm to warm at shower and bath... But then went hot a couple times.

Can't find diagram showing DHW NTC in the poxy manual on my phone.

But I think it's connected into the diverter valve assembly and is labelled "4" on the spade connector boot (the other spade is bare).

I take it the actual NTC is in a wet pocket... Can't determine as couldn't find it in manual. FFS! Diverter valve doesn't even come up when searching the pdf MI's.

In situ the resistance of this NTC (if it is the correct one) is 5.3kohms, and I'm thinking this should be different.

I managed to get access to the supply pipes to the shower valve and fit 15mm levers on them to rule that valve out as crossover but can't do same with floor mounted bath filler.

Does this seem like the NTC or is phex blocked.... Very hot water seems to rule latter out!

TiA

Deano
 

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